The GH3625 superalloy components were manufactured by selective laser melting（SLM）

and multiple pores of different sizes were prefabricated in the interior. The pores of additive components were characterized in 2 D/3 D by X-ray digital radiography and micro-CT. The results indicate that for GH3625 superalloy SLM additive components with a diameter of 5 mm

prefabricated pores with a designed value of all diameters greater than or equal to 0.2 mm can be observed on DR images

and the minimum detectable pore size is 0.18 mm. CT data reveals that the pores with designed diameter of 0.05 mm and 0.1 mm are prefabricated to failure

while all the pores with designed diameter greater than 0.2 mm are successfully prefabricated. Among pores with design diameter of 0.2 mm

only the two are prefabricated to failure

and the rest are successfully prefabricated

and the minimum detected pore diameter is 0.05 mm. The results prove that the measured diameter value is greater than the designed one

with the maximum absolute error of 0.26 mm and the minimum of 0.03 mm. Finally

the pores at different positions were translated to the reference position

and the influence of the X-ray incident direction on the imaging of different pores was analyzed according to the penetration thickness difference combined with the three-dimensional morphology of the pores.